The following report on the Temporary Barriers Project is for your information and action, as appropriate.  This report will be transmitted whenever changes occur to the operation of the barriers, and as a result of modeling and/or field monitoring of water levels in the south Delta.


STATUS AS OF:   October 12, 2012

 

Head of Old River (HOR) Barrier:

Construction of the Spring Head of Old River barrier began on March 15, 2012. Barrier closure and operation were achieved at noon on April 1, all eight slide-gate culverts were in the open position. Operation of the HOR barrier was concluded on May 31, 2012.  Removal of the barrier began on June 1, 2012, starting with the clay section and the concrete mats.  The barrier was breached on Monday, June 4, and removal of rock fill, culverts, and structures continue.  Full removal of the barrier occurred on June 21, and equipment was removed from the site on June 22, 2012.

The data collection period of the Head of Old River Fish Study is complete, the last juvenile Chinook Salmon release took place on May 27, 2012, and the HTI acoustic telemetry system was turned off on the morning of May 31, 2012.  All fish monitoring equipment was removed by May 31. The analysis of 2012 data, combined with the data collected over the past few years, will give insight into juvenile Chinook and predator behavior in the vicinity of the Head of Old River under differing hydrologic and barrier conditions.

 

Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):

In compliance with the TBP permit requirement, the agricultural barriers removal process will start on October 15, 2012.  The barriers must be breached by October 31, 2012

Notching (flashboard removal at GLC) of the agricultural barriers was completed on September 14, 2012 to allow salmon passage. The removal of the GLC will begin on October 15, 2012 and barrier breaching is scheduled on October 22, 2012

Construction of the Middle River barrier began on March 12 and closure was obtained on March 16.  All flap gates are tidally operated. The center weir was raised by one foot on Tuesday July 3. The removal of the Middle River barrier will begin on October 29, 2012. It will take about one week to complete breaching and site restoration.

Construction of the Old River near Tracy barrier began on March 15, and closure and operation started on March 31. The boat ramp and portage is in full operation as of Wednesday, April 4. Demobilizing and site cleanup was completed on Friday April 6. As of July 11, all flap gates have been released to tidal operation. Six of nine culvert flap-gates were tied open on August 13 and released to tidal operation on August 17 at 1 PM. The removal of the Old River near Tracy barrier will begin on October 15, 2012, breaching is scheduled on October 22, 2012.

 

Environmental Permits Compliance Reporting:

Nothing to report.

Water Quality Monitoring:

Nothing to report.

Water Levels and Water Quality Notifications:

Staff continues to closely monitor South Delta water levels and quality. No problems were reported.

 

Modeling:

Modeling results are attached and forecasted minimum water levels are above target levels at Middle River at Howard Road (MHR).  However, minimum water levels at Old River at Tracy Boulevard (OLD), and Grantline Canal at Doughty Cut (DGL) will be below our target when OLD is breached on October 19, 2012.

Water levels for the forecast period are as follows:

MHR – Actual low water levels are approximately the same as modeled forecast. Minimum model forecasted water levels will occur on October 26, 2012 at approximately 0.9 ft (~ 0.6 ft above the target level of 0.3 ft.)
OLD – Actual low water levels are approximately the same as modeled forecast.  Minimum model forecasted water levels will occur on October 22, 2012 at approximately -0.7 ft  (~ 0.7 ft below the target level of 0.0 ft.)
DGL – Actual low water levels are approximating the same as modeled forecast.  Minimum model forecasted water levels will occur on October 22, 2012 at approximately -0.5 ft  (~ 0.5 ft bwlow the target level of 0.0 ft.)

 

Real-time south Delta water level data is available on CDEC at the URL below:

http://cdec.water.ca.gov/river/southdeltaStages.html

 

These weekly updates are also available for your information on our website:
http://baydeltaoffice.water.ca.gov/sdb/tbp/web_pg/tempbar/weekly.cfm


If you know of anyone else that should be receiving this update, please let me know by email, and I'll add them to the mailing list.  Thanks!

Jacob McQuirk, P.E.
Chief, Temporary Barriers Project and Lower San Joaquin
Bay-Delta Office
California Department of Water Resources
1416 9th St., P.O. Box 942836
Sacramento, CA 94236-0001
Phone: (916) 653-9883  FAX: (916) 653-6077
Cell: (916) 425-6857 E-Mail: jacobmc@water.ca.gov